Paul from SWISCO responded:
October 4, 2016
Hmm... are you able to see up into the channel? You could use a mirror to see if there is a clip attached somewhat deeper into the frame, like the 17-043. If no clip is there, you might need something like our 17-094 clip, but to be honest I'm not entirely sure. I'm afraid I'm not familiar with what Pan American used on their spiral balances.
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